# coding: utf-8
#
# Copyright © 2013 Ejwa Software. All rights reserved.
#
# This file is part of gitinspector.
#
# gitinspector is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# gitinspector is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with gitinspector. If not, see <http://www.gnu.org/licenses/>.

from __future__ import unicode_literals
import getopt


class InvalidOptionArgument(Exception):
    def __init__(self, msg):
        super(InvalidOptionArgument, self).__init__(msg)
        self.msg = msg


def __find_arg_in_options__(arg, options):
    for opt in options:
        if opt[0].find(arg) == 0:
            return opt

    return None


def __find_options_to_extend__(long_options):
    options_to_extend = []

    for num, arg in enumerate(long_options):
        arg = arg.split(":")
        if len(arg) == 2:
            long_options[num] = arg[0] + "="
            options_to_extend.append(("--" + arg[0], arg[1]))

    return options_to_extend

# This is a duplicate of gnu_getopt, but with support for optional arguments in long options, in the form; "arg:default_value".


def gnu_getopt(args, options, long_options):
    options_to_extend = __find_options_to_extend__(long_options)

    for num, arg in enumerate(args):
        opt = __find_arg_in_options__(arg, options_to_extend)
        if opt:
            args[num] = arg + "=" + opt[1]

    return getopt.gnu_getopt(args, options, long_options)


def get_boolean_argument(arg):
    if isinstance(arg, bool):
        return arg
    elif arg == None or arg.lower() == "false" or arg.lower() == "f" or arg == "0":
        return False
    elif arg.lower() == "true" or arg.lower() == "t" or arg == "1":
        return True

    raise InvalidOptionArgument(_("The given option argument is not a valid boolean."))
